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A Virginia<\/a> farmhouse that spent its first 184 years in Sussex County now sits on the Potomac River, just downstream from George Washington<\/a><\/strong>‘s Mount Vernon\u2014and it’s recently found a buyer.<\/p>\n Known as Carlby<\/a>, the five-bedroom house measures 2,992 square feet on 2.18 acres at 4509 Carlby Lane in Alexandria and is listed for $3,799,000. Now marked as “contingent,” the home is listed with Andrea Courduvelis<\/strong> and Diane G. Murphy<\/strong> of TTR Sotheby’s International Realty<\/a>.<\/p>\n It dates to 1762, when it stood in Sussex County and went by the Mitchell House. In 1946, Carl W. Porter<\/strong>, Fairfax County’s director of public works and a retired Navy captain, bought it and had it dismantled before it was carted north to waterfront land that had once been part of Washington’s Mount Vernon estate. He and his wife, Beatrice<\/strong>, renamed it Carlby.<\/p>\n